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Note 10 - Revenue (Details Textual) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2018 USD ($)	Jun. 30, 2017	Jun. 30, 2018 USD ($)	Jun. 30, 2017	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Jan. 05, 2018	Jan. 01, 2018 USD ($)
Contract with Customer, Liability, Total		$ 152,051		$ 152,051		$ 160,582	$ 150,983		$ 160,600
Contract with Customer, Liability, Revenue Recognized	[1]	$ 55,284		125,253
Namecheap, Inc. [Member]
Domain Name Transfer to Counter Party								2,650,000
Contract with Customer, Liability, Revenue Recognized				$ 14,600
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Number of Customers		0	0	1	0
Concentration Risk, Percentage				11.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Customers				0		0
[1] As a result of the bulk transfer of 2.65 million domain names to Namecheap on January 5, 2018, recognized revenue for the six months ended June 30, 2018 includes $14.6 million related to previously deferred revenue for these names.

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The amount of domain names transfered to a counter party.

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